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Aridity drives coordinated trait shifts but not decreased trait variance across the geographic range of eight Australian trees

Anderegg, LDL, Loy, X, Markham, IP, Elmer, CM, Hovenden, MJ ORCID: 0000-0001-7208-9700, HilleRisLambers, J and Mayfield, MM 2020 , 'Aridity drives coordinated trait shifts but not decreased trait variance across the geographic range of eight Australian trees' , New Phytologist, vol. 229, no. 3 , pp. 1375-1387 , doi: 10.1111/nph.16795.

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Abstract

Large intraspecific functional trait variation strongly impacts many aspects of communities and ecosystems, and is the medium upon which evolution works. Yet intraspecific trait variation is inconsistent and hard to predict across traits, species and locations.We measured within-species variation in leaf mass per area (LMA), leaf dry matter content (LDMC), branch wood density (WD), and allocation to stem area vs leaf area in branches (branch Huber value (HV)) across the aridity range of seven Australian eucalypts and a co-occurring Acacia species to explore how traits and their variances change with aridity.Within species, we found consistent increases in LMA, LDMC and WD and HV with increasing aridity, resulting in consistent trait coordination across leaves and branches. However, this coordination only emerged across sites with large climate differences. Unlike trait means, patterns of trait variance with aridity were mixed across populations and species. Only LDMC showed constrained trait variation in more xeric species and drier populations that could indicate limits to plasticity or heritable trait variation.Our results highlight that climate can drive consistent within-species trait patterns, but that patterns might often be obscured by the complex nature of morphological traits, sampling incomplete species ranges or sampling confounded stress gradients.

Item Type: Article
Authors/Creators:Anderegg, LDL and Loy, X and Markham, IP and Elmer, CM and Hovenden, MJ and HilleRisLambers, J and Mayfield, MM
Keywords: Eucalyptus, functional traits, intraspecific trait variation, water availability gradient, trait variance, plant, trait, aridity, leaf economics, natural selection
Journal or Publication Title: New Phytologist
Publisher: Blackwell Publishing Ltd
ISSN: 0028-646X
DOI / ID Number: 10.1111/nph.16795
Copyright Information:

Copyright 2020 The AuthorsNew Phytologist Copyright 2020 New Phytologist Foundation

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